Process of purifying gas.



TED STATES PATENT OFFICE.

-CH.ABLES J. o'imNNnL'L AND ALBERT r. KIJ'NBERGER, or PHILADELPHIA, PENN- SYLVANIA, ASSIGNOBS 'ro THE UNITED oAs IMPROVEMENT COMPANY, or

BHILADEL'PHI PENNSYLVANIA, A CORPORATION or PENNSYLVANIA.

PROCESS OF 'PUBIFYING GAS.

No Drawing.

Specification of Letters Patent Patented July 28, 19314. Application filed A ril 18, 1913. Serial no. 7e1,sao.

i To all who're it may concern:

ferent composition than ordinary gas as heretofore made and supplied.

The elimination of carbon bi-sulfid like the elimination of other sulfur compounds such as hydrogen sulfid is advantageous be cause when gas containing sulfur or sulfur compounds is burned the ultimate result is the formation of sulfurous and sulfuric acids which are noxious and deleterious substances.

The present invention is based on the' discovery that iron oxid having a certain kind of physical structure-if utilized at an appropriate temperature will remove carbon bi-sulfid from gas in a practical manner and upon a commercial scale.

According to this invention the gas is purified and freed from carbon bi-sulfid. and by freed is meant that carbon bi-sulfid in deleterious quantities is removed, by pass ing it through ferric oxid of appropriate physical structure and at a proper temperature. This not only removes the carbon bisulfid, as has been said, but also removes sulfureted hydrogen if present in the gas.

However, sulfureted hydrogen would ordi- I conslsts in removing carbon bi-sulfid by.

narily be removed prior to the removal of the carbon bi-sulfid by some well known method of purification at a lower temperature than is used for removing the carbon bi-sulfid in accordance with this invention.

nous. It may be described as a precipitate of yellow or ocher color having the probable' formula Fe O,.n(H O) containing at least a half molecule of water and preferably more. The described hydrated ferric mod is easily obtainable and is well known as a by-product, for example, it occurs as a by-product in the manufacture of alum from bauxite where the iron occurs as an impurity and is removed by precipitation.

Good results are obtained by heating the ferric oxid to a temperature'of from 400 to 450 F more or less, and keeping it at that temperature while the gas to be purified is passing through it. The gas may be passed through the described hydrated ferric oxid at the rate of 11,000 cubic feet per bushel of purifying material in twentyfour hours, more or less, and the capacity of the purifying material is very large, meaning that comparatively little of it will purify a large amount of gas.

The temperatures above given are notab- I 'used successfully for that purpose.

What we claim is:

1. The process of purifying gas which consists in removing carbon bi-'sulfid by passing the gas through hot and dry ferric oxid; substantially as described.

2. The process of purifying gas which passing the gas through hot and dry previously precipitated hydrated ferric substantially as described.

3. The process of purifying gas which consists in removing carbon bisulfid by passing the gas through hot ferric oxid havmg the probable formula. Fe,O,,.(H,O).

4L. The process of purifying gas which passing the gas through hot and dry fiufiyconsists in heating ferric oxid to substanor vohnnlnous ferric oxid. tially from 400 to450 F. and passing the In testimony whereof we have hereunto gas through the same, thereby removing signed our names.

5 carbon bi-sulfid. Q T

CHARLES J. ODOBNELL. 5. The process of purifying gas hlch r I 1 4 consists in heating yellow or ocher iroi i oxid ALBERT LUNBERUER' and passing the gas through the same. Witnesses:

6. Theprocess of purifying gas Which Gr, Zn Sononns,

10 consists in removing carbon 'bi-sulfidl by W. H. FULWEHER. 

